One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(9,10)(11,14)(12,15)(13,16)(17,18,22,26)(19,23,30,39)(20,24,32,41)(21,25,35,44)(27,36,45,47)(28,37,29,38)(31,40,46,48)(33,42,34,43)(2,5)(6,8)(9,11,13,12)(10,14,16,15)(17,19,22,30)(18,23,26,39)(20,31,32,46)(21,28,35,29)(24,40,41,48)(25,37,44,38)(27,34,45,33)(36,43,47,42)(9,11,13,12)(10,15,16,14)(17,20)(18,24)(19,27)(21,34)(22,32)(23,36)(25,43)(26,41)(28,31)(29,46)(30,45)(33,35)(37,40)(38,48)(39,47)(42,44)(9,12,13,11)(10,15,16,14)(19,28)(21,35)(23,37)(25,44)(27,31)(29,30)(33,34)(36,40)(38,39)(42,43)(45,46)(47,48)(1,3,4,7)(2,6,5,8)(20,32)(24,41)(27,45)(31,46)(33,34)(36,47)(40,48)(42,43)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.